Unincorporated Lassen County prohibits unnecessary use of vehicle horns and signaling devices under County Code Section 9.65.050 (other than as allowed by the Vehicle Code). On-road vehicle exhaust and muffler noise is governed by the California Vehicle Code, which the county's Noise Element directs the Sheriff to help enforce.
Section 9.65.050 of the Lassen County Code lists, among the specific prohibited acts that are a public nuisance, unnecessarily using or operating a vehicle horn, signaling device or other similar device, other than as regulated by the Vehicle Code. Beyond horns, on-road motor-vehicle exhaust and muffler noise is primarily a matter of state law: California Vehicle Code Section 27150 requires every motor vehicle to have an adequate muffler in good working order and prohibits amplified or modified exhaust, and Section 27151 prohibits modifying an exhaust system to amplify noise. The 2021 Noise Element states the county should encourage enforcement of California Vehicle Code sections relating to adequate mufflers and modified exhaust systems. Traffic noise on public roadways is generally exempt from the Chapter 9.65 sound-level limits where regulation is preempted by the Vehicle Code, with land-use compatibility around highways managed instead through CNEL contours (the 65 dBA CNEL contour) in the county's Master Noise Exhibit.
Unnecessary horn use is a prohibited act under Section 9.65.050, enforced by the Sheriff and by administrative citation under Lassen County Code Chapter 1.20. Defective or modified exhaust is enforced by the Sheriff and CHP under California Vehicle Code Sections 27150-27151, typically as an infraction (a fix-it citation).
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